From the webpage:
This is an international standard development project of ISO Technical Committee 46 (Information and documentation) Subcommittee 9 (Identification and description). The assigned Working Group (known as ISO TC46/SC9/WG8) is revising, merging, and extending two existing international standards: ISO 2788 and ISO 5964. The end product is a new standard—ISO 25964, Information and documentation – Thesauri and interoperability with other vocabularies—supporting the development and application of thesauri in today’s expanding context of networking opportunities. It is being published in two parts, as follows:
ISO 25964, Thesauri and interoperability with other vocabularies
- Part 1: Thesauri for information retrieval
- Part 2: Interoperability with other vocabularies
Part 1 was published in August, 2011 and Part 2 is due to appear by the end of 2011.
Unless you have $332 (US) burning a hole in your pocket, you probably want to visit: Format for Exchange of Thesaurus Data Conforming to ISO 25964-1, which has the XML schema plus documentation, etc., await for your use.
I am very interested in how they handled interoperability in part 2.